Dihybrid Crosses: Ho Hlahloba Metheo ea Liphatsa tsa Lefutso tsa Mendelian
E 'ngoe ea likhopolo tsa motheo ka ho fetisisa liphatsa tsa lefutso ke sefapano sa dihybrid. Khopolo ena e ile ea hlahisoa ka lekhetlo la pele ke Gregor Mendel, moitlami le rasaense oa lekholong la bo19 la lilemo ea tsejoang e le ntate oa liphatsa tsa lefutso. Litekong tsa hae ka limela tsa lierekisi, Mendel o ile a senola ka katleho mekhoa ea motheo ea lefa e fetohileng motheo oa liphatsa tsa lefutso tsa sejoale-joale. Sehlooho sena se tla teba haholoanyane sefapanong sa dihybrid, melao-motheo ea sona ea motheo, le ts'ebeliso ea sona le bohlokoa ba sona masimong a fapaneng a saense.
Ho utloisisa Dihybrid Crosses
Sefapano sa dihybrid ke sefapano pakeng tsa dihlopha tse pedi tse fapaneng tse nang le di-heterozygous bakeng sa dipara tse pedi tse fapaneng tsa dibopeho. Sena se fapana le sefapano sa monohybrid, moo ho sekasekwang tšobotsi e le nngwe. Mohlala, dimeleng tsa dierekisi, motho a ka batla ho hlahloba lefa la dibopeho tse pedi ka nako e le nngwe, tse kang mmala wa peo (mosehla kapa o motala) le sebopeho sa peo (se chitja kapa se sosobaneng).
Ho utloisisa lifapano tsa dihybrid, re hloka ho utloisisa melao e 'meli e hlahisitsoeng ke Mendel:
1. Molao oa Karohano: Motho ka mong o na le para ea li-allele bakeng sa tšobotsi ka 'ngoe, 'me li-allele tsena lia aroloa nakong ea ho thehoa ha gamete.
2. Molao oa Mefuta e Ikemetseng: Li-allele tsa litšobotsi tse fapaneng li amahanngoa ka boikemelo nakong ea ho thehoa ha gamete. Sena se bolela hore lefa la tšobotsi e le 'ngoe ha le ame lefa la tšobotsi e 'ngoe.
Mehato ho Dihybrid Crossing
A re nahaneng ka mohlala oa khale oa motsoako oa dihybrid o entsoeng ke Mendel: ho shebella 'mala le sebōpeho sa peo lierekising.
1. Tlhahlobo ea Genotype ea Batsoali: Batsoali ba na le litšobotsi tse peli tse fapaneng, mohlala, YyRr (Y = mosehla, y = tala, R = chitja, r = makukuno).
2. Sebopeho sa Gamete: Li-allele tsa litšobotsi tse peli tse fapaneng li ka amahanngoa ho theha li-gamete ka metsoako e latelang: YR, Yr, yR, selemo. Metswako ka 'ngoe ea tsena e etsahala ka makhetlo a lekanang ka lebaka la molao oa mefuta e ikemetseng ea li-attachment.
3. Sebopeho sa Chate ea Punnett: Ka ho sebelisa chate ea Punnett, re ka bolela esale pele metsoako e ka bang teng ea liphatsa tsa lefutso tsa bana. Tabeng ena, chate ea 4×4 ea Punnett e sebelisoa ho thathamisa metsoako eohle e ka bang teng ea gamete.
4. Ho Fumana Karolelano ea Phenotypic: Ho tsoa metswakong ena, re ka fumana li-phenotype tse hlahang. Tabeng ea Mendel, karolelano ea phenotypic e fumanoeng ke 9:3:3:1 bakeng sa motsoako o felletseng (9 e chitja e mosehla, 3 e chitja e tala, 3 e sosobaneng e mosehla, 1 e sosobaneng e tala).
Bohlokoa le Tšebeliso
Khopolo ea lifapano tsa dihybrid ha se ea bohlokoa feela baelojing, empa hape e na le lits'ebetso tse pharaletseng tsa lefats'e la nnete masimong a fapaneng:
1. Ho Ikatisa Limela le Liphoofolo
Temong, melao-motheo ea lefa la Mendelian e sebelisoa ho nts'etsapele mefuta ea limela le liphoofolo e nang le litšobotsi tse lakatsehang. Mohlala, ka ho utloisisa hore na litšobotsi tse itseng li futsitsoe joang, bahlahisi ba ka khetha liphoofolo tse nang le litšobotsi tse itseng tse hlahisang litholoana ho hlahisa bana ba betere.
2. Liphatsa tsa lefutso tsa bongaka
Ho batho, melao-motheo e tšoanang e sebelisoa thutong ea ho futsa mafu a liphatsa tsa lefutso. Mafu a mang a laoloa ke liphatsa tsa lefutso tse fetang e le 'ngoe (polygenic), 'me ho utloisisa likamano tsena tse rarahaneng ho ka thusa ho hlahloba le ho nts'etsapele phekolo.
3. Biotechnology le Boenjiniere ba Liphatsa tsa Lefutso
Kutloisiso e batsi ea liphatsa tsa lefutso tsa motheo, ho kenyeletsoa le lifapano tsa dihybrid, ke ea bohlokoa theknolojing ea baeloji. E nolofalletsa ho fetoloa ha liphatsa tsa lefutso ho etsa lintho tse phelang tse nang le litšobotsi tse lakatsehang, maemong a bongaka le a indasteri.
4. Patlisiso ea Saense le Thuto
Phuputsong ea motheo, li-dihybrid cross e ntse e le sesebelisoa sa bohlokoa sa ho ithuta lefa la liphatsa tsa lefutso le likamano tsa allelic. Thutong, khopolo ena e sebelisoa ho ruta baithuti metheo ea liphatsa tsa lefutso.
Meeli le ho rarahana
Leha ho le jwalo, ho na le meedi molaomotheong ona o bonolo wa ho kopanya diphatsa tse ikemetseng. Hase diphatsa tsohle tsa lefutso tse fuwang ka botsona; diphatsa tse ding tsa lefutso di haufi le tse ding ho chromosome e le nngwe mme di ka fuwa mmoho, e leng ketsahalo e tsejwang e le kgokelo ya diphatsa tsa lefutso. Sena se eketsa lera le leng la ho rarahana dithutong tsa diphatsa tsa lefutso tse hlokang ho nahannwa tlhahlobong e eketsehileng.
Lintlafatso tsa morao-rao
Lilemong tse mashome tsa morao tjena, tsoelo-pele theknolojing ea liphatsa tsa lefutso, joalo ka tatellano ea DNA le lisebelisoa tsa tlhahlobo ea genomics, li tebisitse kutloisiso ea rona ea liphatsa tsa lefutso ho feta melao-motheo ea mantlha ea Mendel. Leha ho le joalo, melao-motheo ea motheo ea Mendel, joalo ka ha e sebelisoa ho lifapano tsa dihybrid, e ntse e le ea bohlokoa 'me hangata e sebeletsa e le motheo oa lintho tse ncha tse rarahaneng haholoanyane.
Qetello
Dihybrid crosses ke tšiea ea bohlokoa ea liphatsa tsa lefutso tsa khale. Ho utloisisa kamoo lipara tse peli tsa litšobotsi li ka futsoang hammoho ho fana ka temohisiso e tebileng mabapi le mekhoa ea motheo ea lefa. Ka ts'ebeliso e pharaletseng temong, bongaka le theknoloji ea baeloji, mekhoa ena ha e ntlafatse tsebo ea rona ea motheo ea baeloji feela empa hape e fana ka litharollo tse sebetsang liphephetsong tsa lefats'e la 'nete. Leha liphephetso tse ncha tse rarahaneng haholo li hlaha, metheo ea liphatsa tsa lefutso tsa Mendelian e ntse e le mohato oa pele oa bohlokoa bakeng sa mang kapa mang ea hlahlobang lefats'e le khahlang la liphatsa tsa lefutso.
